<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <script>
        class Animal {
            constructor(color, age, type, gender) {
                this.color = color;
                this.age = age;
                this.type = type;
                this.gender = gender;
            }
        }
        class Dog extends Animal {
            constructor(color, age, type, gender, name) {
                super(color, age, type, gender);
                this.name = name;
            }
        }
        let dogObj = new Dog('black', 2, 'dog', 'male', 'xiaoheihei');
        console.log(dogObj);


    </script>
</body>

</html>